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  Buck Converter Definition : Buck Converter is a type of  chopper circuit  that is designed to perform step-down conversion of the applied dc input signal. In the case of buck converters, the fixed dc input signal is changed into another dc signal at the output which is of lower value. This means it is designed to produce a dc signal as its output that possesses a lower magnitude than the applied input. It is sometimes called  Step-down DC to DC Converter  or  Step-down Chopper  or  Buck Regulator . Introduction We have already discussed in our previous content that choppers are the circuits that are designed to perform the conversion of a fixed dc signal into an adjustable dc signal. It is mainly designed to increase or decrease the voltage level of the signal applied at its terminals. There are various power semiconductor devices such as power BJT, power MOSFET, IGBT, GTO, etc. that acts as a switch in the chopper circuits. The use of thyristor is generally prohibited in chopper cir